Harford County sheriff's deputies said they were investigating suspicious activity around 8 p.m. Wednesday in the area of Maryland Routes 7 and 152 when they tried to pull over a red Ford Ranger pickup truck that instead sped away.

Deputies pursued the truck into Baltimore County along Route 7 and onto northbound Cowenton Avenue in the Perry Hall area, where Baltimore County police were called in to help out.

Officials said the truck's driver, Arvel Douglas Williams, 30, of Baltimore, drove around a traffic circle at Cowenton Avenue and East Joppa Road before driving across a median and crashing into a Baltimore County patrol car.

According to a witness, police used a public announcement system, ordering Williams to surrender. The witness said as officers approached Williams with guns drawn, he tried to take off running, and that's when he was hit with a Taser.

Police confirmed Harford County deputies used a Taser on Williams when he resisted arrest, and they took him into custody. Officials said Williams was initially talking to officers once he was handcuffed, but he then had some sort of medical emergency.

The witness said he also noticed Williams talking with police, then suddenly officers were performing CPR on him.

Officials said preliminary evidence gathered at the scene showed Williams may have ingested some sort of drug. Harford County authorities said Williams had a white powdery substance covering his face and inside his truck.

The medical examiner will perform an autopsy to determine how he died.

No sheriff's deputies or police officers were injured during the incident. The deputies involved were placed on routine administrative leave.

Baltimore County homicide detectives continue to investigate the case.